A series-connected inductor and ohmic resistance are connected to a source of constant voltage EMF E (figure). The inductance of the inductor, when an iron core G is inserted into it, is equal to L1, and without the core - L2. First, the core was inserted and the current in the circuit was established. At time t = 0, the core is removed very quickly (in a time much less than the relaxation time). Determine the current in the circuit I(t) at t > 0.

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